appserver has NOTHING to do with a register page particularily >.<
appserver is simply a collection of programs and tools to control an apache webserver, mysql database and w/e else they've thrown into the pack.
The register script will depend on your source and if it uses flatfile (5165 lotf generally) or sql. Write up a php script and load it into the apache web server (usually a folder in your appserver install directory labled htdocs or web or something similar.) Once there, make sure you have your port 80 forwarded so people can connect using a browser and they should be able to view the website.
There are a BUNCH of scripts already posted all over epvp... find one you like and work with it if you don't know php... or learn php and do it yourself.